A:AnswerAs I understand your question, Yes.
3.5 audio from the headphone (Windows computer) will take sound to the Scarlett 2i2 XLR audio interface which connects to your speakers.
A:AnswerThe software is in the focusrite.com homepage, when you go to the website all you gotta do is choose what model you bought ( i registered mine with focusrite as well at the same time while i was downloading the software )